Impacts of Nickel Nanoparticles on Mineral Carbonation

Abstract

This work presents experimental results regarding the use of pure nickel nanoparticles (NiNP) as a mineral carbonation additive. The aim was to confirm if the catalytic effect of NiNP, which has been reported to increase the dissolution of CO2 and the dissociation of carbonic acid in water, is capable of accelerating mineral carbonation processes. The impacts of NiNP on the CO2 mineralization by four alkaline materials (pure CaO and MgO, and AOD and CC steelmaking slags), on the product mineralogy, on the particle size distribution, and on the morphology of resulting materials were investigated. NiNP-containing solution was found to reach more acidic pH values upon CO2 bubbling, confirming a higher quantity of bicarbonate ions. This effect resulted in acceleration of mineral carbonation in the first fifteen minutes of reaction time when NiNP was present. After this initial stage, however, no benefit of NiNP addition was seen, resulting in very similar carbonation extents after one hour of reaction time. It was also found that increasing solids content decreased the benefit of NiNP, even in the early stages. These results suggest that NiNP has little contribution to mineral carbonation processes when the dissolution of alkaline earth metals is rate limiting.

Purification of slag-derived leachate and selective carbonation for high-quality precipitated calcium carbonate synthesis

“…Based on our recent work on carbonation in open reactors (i.e. <1 atm CO2), PCC synthesis can be accomplished in even less severe conditions, especially in the presence of sonication [19] or nickel catalyst [20]. Also, carbonation is an exothermic reaction, so in an insulated continuous reactor (e.g.…”

Photochemical Enhancement in Catalytic Activity of Nickel Nanoparticles for Hydration of CO2

“…NiNPs have previously been used to catalyse carbonation of steel slag wastes to capture CO 2 . It was also found that the carbonation time could be reduced by half for aqueous carbonation of CaO and MgO in the presence of NiNPs . NiNPs employed to enhance CO 2 separation using potassium carbonate solutions showed an increase of two‐fold in the rate of CO 2 absorption .…”

“…NiNPs have previously been used to catalyse carbonation of steel slag wastes to capture CO 2 . It was also found that the carbonation time could be reduced by half for aqueous carbonation of CaO and MgO in the presence of NiNPs .…”

Research Regarding the Partial Replacement of Aggregates in Concrete with a By-Product of Steel Industry

“…The burden of the mentioned study was the weathering of the industrial by-product through the process named carbonation with the purpose to diminish the CaO content, responsible for slag swelling in prolonged contact with water. Different studies regarding mineral carbonation of LD slag also occurred [5][6][7][8], and the process, although rapid and efficient remains costly. The present study aimed using an already marketed material obtained from the same LD slag, namely LiDonit.…”